I think it's interesting and good to know what a gun's choke constriction is but my determination for how tight a gun shoots comes from pattern testing, a 30" circle at 40 yards. The amount of constriction gives a good idea what a gun should do but I have been surprised by some of my results on a pattern board. Examples; Remington 1900 12ga, .014 and .024 patterned 72% and 86%. Lefever F grade 10ga, .003 and .018, patterned 53% and 85%.
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